Diagnosis: From the specialty exams (radiographs) and clinical signs that were seen in this case it is evident that this foal has a fracture of the ulna, specifically of the olecranon. These fractures are usually a result of a kick or fall. There was a history of trauma in this case to also support this diagnosis. The fracture identified on the radiograph is transverse, extending through the semilunar notch and is articular. There is no evidence of the fracture trying to repair itself at this location. This is probably because there is a gap between the two pieces of bone. The olecranon is subjected to tensile forces that are pulling the fractured portion of the olecranon proximally. There are tendons of the muscles of the triceps that insert at the caudal aspect of the olecranon that are responsible for these forces. The triceps muscle group is responsible for extension of the elbow joint, and this is most likely the reason for the foal's inability to extend this joint. This is also the reason for the appearance of a dropped elbow. Without the constant tension of the triceps muscles on the olecranon the elbow will not be held tight to the body wall anymore and look like it is "dropped."